Hope all are OK.

When I do type training for a pilot new to an advanced type, I will insist on a reasonable demonstration of full on forced approaches. Trainers are pretty easy to manage, but Cessna amphibians and multi modified airplanes can be different. The amount of inertia stored in speed, compared to the drag in the flare can be more than expected, so the power overshoot cheats the candidate pilot of a true understanding of what the flare will be like. New pilots should practice full on forced approaches in the trainers to build skills. I have found ATC quite accommodating with the request, as they usually like to watch! A few summers back, I mentored eight at Bergen Flesland airport, with one pause for a commercial inbound. It's a worthwhile skill which could save a plane, and your neck! I'm happy that the C150 occupants were "OK", but I doubt that they're entirely unharmed....

You are assuning there was enough fuel for the sortie... It would not be the 1st time, would it?

This was my favourite aircraft to fly at Tatenhill. I know nothing of the incident, but the grass up there gets very boggy in winter. The grass taxiway next to 26 is always too wet to use after rain, and even the gras parkng area is usually closed in winter. So touh down and nose flip is my guess. But why engine failed I dont know.